nd21
FCP = Fluorescent coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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ND21 - Northern Ireland 8p red, FCP/PVAD, two 4.75mm screen 250 phosphor bands (Cyl 1) (Harrison/photo) - Deegam N80.1.1 - S.G specialised XN33 - Stoneham U33 - Concise NI24

Two 4.75mm phosphor bands from cylinder 1 [23.1.74]